$$y _ { 1 } + y _ { 2 } + y _ { 3 } = 8$$
$y_{1}=8-y_{3}-y_{2}$
$$y_{1}+y_{3}=8-y_{2}$$
$$y_{1}=8-y_{2}-y_{3}$$
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$y_{2}=8-y_{3}-y_{1}$
$$y_{2}+y_{3}=8-y_{1}$$
$$y_{2}=8-y_{1}-y_{3}$$
